2423 Ibarruri, provisional designation , is an eccentric, tumbling and rare-type

asteroid An asteroid is a minor planet—an object larger than a meteoroid that is neither a planet nor an identified comet—that orbits within the Solar System#Inner Solar System, inner Solar System or is co-orbital with Jupiter (Trojan asteroids). As ...

, classified as slow rotator and sizable

Mars-crosser A Mars-crossing asteroid (MCA, also Mars-crosser, MC) is an asteroid whose orbit crosses that of Mars. Some Mars-crossers numbered below 100000 are listed here. They include the two numbered Mars trojans 5261 Eureka and . Many databases, for i ...

from the inner regions of the

asteroid belt The asteroid belt is a torus-shaped region in the Solar System, centered on the Sun and roughly spanning the space between the orbits of the planets Jupiter and Mars. It contains a great many solid, irregularly shaped bodies called asteroids ...

, approximately 5 kilometers in diameter. The asteroid was discovered by Russian–Ukrainian astronomer

Lyudmila Zhuravleva Lyudmila Vasilyevna Zhuravleva (, ; born 22 May 1946) is a Soviet Union, Soviet, Russian and Ukraine, Ukrainian astronomer, who worked at the Crimean Astrophysical Observatory in Nauchnij, where she discovered 213 minor planets. She also serves a ...

at the

Crimean Astrophysical Observatory The Crimean Astrophysical Observatory (CrAO, obs. code: 095) is located at Nauchnij research campus, near the Central Crimean city of Bakhchysarai, on the Crimean peninsula. CrAO is often called simply by its location and campus name ...

in Nauchnyj, on 14 July 1972. It was named after Spanish communist

Rubén Ruiz Ibárruri Rubén Ruiz Ibárruri (; January 9, 1920 – September 3, 1942) was a Spanish military officer and Soviet commander of the 100th Machine Gun Company of an independent training battalion of the 35th guards rifle division of the 62nd army of the S ...

Orbit and classification

''Ibarruri'' orbits the Sun in the inner main-belt at a distance of 1.6–2.8 AU once every 3 years and 3 months (1,183 days). Its orbit has an

eccentricity Eccentricity or eccentric may refer to: * Eccentricity (behavior), odd behavior on the part of a person, as opposed to being "normal" Mathematics, science and technology Mathematics * Off-Centre (geometry), center, in geometry * Eccentricity (g ...

of 0.28 and an

inclination Orbital inclination measures the tilt of an object's orbit around a celestial body. It is expressed as the angle between a reference plane and the orbital plane or axis of direction of the orbiting object. For a satellite orbiting the Eart ...

of 4 ° with respect to the

ecliptic The ecliptic or ecliptic plane is the orbital plane of Earth's orbit, Earth around the Sun. It was a central concept in a number of ancient sciences, providing the framework for key measurements in astronomy, astrology and calendar-making. Fr ...

Physical characteristics

The

spectral type In astronomy, stellar classification is the classification of stars based on their spectral characteristics. Electromagnetic radiation from the star is analyzed by splitting it with a prism or diffraction grating into a spectrum exhibiting the ...

of the asteroid is that of a rare A-type in the SMASS taxonomy, with its surface consisting of almost pure

olivine The mineral olivine () is a magnesium iron Silicate minerals, silicate with the chemical formula . It is a type of Nesosilicates, nesosilicate or orthosilicate. The primary component of the Earth's upper mantle (Earth), upper mantle, it is a com ...

, which gives the body a very reddish color. As of November 2015, only 17 minor planets of this type are known. As a spectroscopic A-type asteroid, it belongs to the larger group of bodies with a silicaceous composition. However, the Collaborative Asteroid Lightcurve Link classifies the asteroid into the

carbonaceous Carbonaceous refers to something relating to, containing, or composed of carbon. It is a descriptor used for the attribute of any substance rich in carbon. Particularly, ''carbonaceous hydrocarbons'' are very unsaturated, high- molecular-weight h ...

group, despite the fact that is assumes a relatively high

geometric albedo In astronomy, the geometric albedo of a celestial body is the ratio of its actual brightness as seen from the light source (i.e. at zero phase angle (astronomy), phase angle) to that of an ''idealized'' flat, fully reflecting, diffuse reflection, d ...

of 0.20, which is rather typical for stony asteroids.

Slow rotator and tumbler

''Ibarruri'' has a notably slow

rotation period In astronomy, the rotation period or spin period of a celestial object (e.g., star, planet, moon, asteroid) has two definitions. The first one corresponds to the '' sidereal rotation period'' (or ''sidereal day''), i.e., the time that the objec ...

of 140 hours, and seems to be in a non-principal axis rotation (NPAR), colloquially called as "tumbling".

Naming

This

minor planet According to the International Astronomical Union (IAU), a minor planet is an astronomical object in direct orbit around the Sun that is exclusively classified as neither a planet nor a comet. Before 2006, the IAU officially used the term ''minor ...

was named after

(1920–1942), son of Spanish communist leader

Dolores Ibárruri Isidora Dolores Ibárruri Gómez (; 9 December 189512 November 1989), also known as ("the passionate one" or Passion flower"), was a Spanish Republican politician during the Spanish Civil War (1936–1939) and a communist. She is renowned for ...

and a posthumous

Hero of the Soviet Union The title Hero of the Soviet Union () was the highest distinction in the Soviet Union, awarded together with the Order of Lenin personally or collectively for heroic feats in service to the Soviet state and society. The title was awarded both ...

. He enlisted in the Soviet army and died in the early stage of the

Battle of Stalingrad The Battle of Stalingrad ; see . rus, links=on, Сталинградская битва, r=Stalingradskaya bitva, p=stəlʲɪnˈɡratskəjə ˈbʲitvə. (17 July 19422 February 1943) was a major battle on the Eastern Front of World War II, ...

in September 1942. The official naming citation was published by the

Minor Planet Center The Minor Planet Center (MPC) is the official body for observing and reporting on minor planets under the auspices of the International Astronomical Union (IAU). Founded in 1947, it operates at the Smithsonian Astrophysical Observatory. Funct ...

on 8 February 1982 ().

Orbit and classification

Physical characteristics

Slow rotator and tumbler

Naming

Notes

References

External links